Craftsman 139.21242 Owner's Manual page 3

Setup
Connect the adapter to the garage door
monitor and a standard 110 Vac outlet.
NOTE:Depending on the planned location
of the monitor within the home, it may be
more convenient to temporarily place the
monitor near the GarageDoor Opener
during programming. Onceprogramming
is complete place the monitor in the
desired location.
Programming
1. Press and releasethe Learn button on
the back of the garage door monitor.
Within 60 seconds, press and release
the Learn button on the garage door
opener. Two short beeps will confirm
the garage door monitor has been
successfully programmed.
NOTE: Toprogram additional garage door
openers, repeat the steps above on each
individual garage door opener. Thegarage
door monitor can be programmed with up
to four garage door openers.
ERASEMEMORY
To erase all programmed garage door openers from the garage door monitor, press and
hold the Learn button on the garage door monitor for at least six seconds. One short beep
will be heard at the beginning, one short beep will confirm that all codes have been
erased.